Natively retrieve initial notification (iOS)

App.js

import React, { Component } from 'react';
import { View } from 'react-native';
import NativeHelpers from './NativeHelpers'; 

class App extends Component {
    componentDidMount() {
      const initialPush = await NativeHelpers.getInitialNotification();
      // Do something with initial push
    }
  
    render() {
        return (
          <View></View>
        );
    }
}

export default App;

NativeHelpers.js

import { NativeModules, Platform } from 'react-native';

async function getInitialNotification() {
    if (Platform.OS === 'ios') {
        return await NativeModules.NativeHelpers.getInitialNotification();
    }

    return null;
}

export default {
    getInitialNotification
};

NativeHelpers.m

#import <React/RCTBridgeModule.h>

@interface RCT_EXTERN_MODULE(NativeHelpers, NSObject)

RCT_EXTERN_METHOD(getInitialNotification:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject)

- (dispatch_queue_t)methodQueue
{
    return dispatch_get_main_queue();
}

+ (BOOL)requiresMainQueueSetup
{
    return YES;
}

@end

NativeHelpers.swift

import UIKit

@objc(NativeHelpers)
class NativeHelpers: NSObject {
    @objc
    func getInitialNotification(_ resolve: RCTPromiseResolveBlock, reject: RCTPromiseRejectBlock) {
        let launchOptions = (UIApplication.shared.delegate as! AppDelegate).launchOptions
        let notification = launchOptions?[UIApplication.LaunchOptionsKey.remoteNotification]
        resolve(notification)
    }
}